Vaisala DPT146 Guide de l'utilisateur Page 69

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Appendix A _________________________________________________________ Modbus Reference
VAISALA ________________________________________________________________________ 67
Modbus Register Map
Table 22 Modbus Register Map
Logical
Address
(decimal)
PDU Address
(hexadecimal)
Register Description
Data
Format
Register
Type
Notes
5
00 04
T
(measured)
LSW
MSW
32-bit
float
read-only
°C
6
00 05
7
00 06
T
d/f
(measured)
LSW
MSW
32-bit
float
read-only
°C
8
00 07
11
00 0A
T
d/f
(atm)
(measured)
LSW
MSW
32-bit
float
read-only
°C
12
00 0B
21
00 14
H
2
O (measured)
LSW
MSW
32-bit
float
read-only
ppm
v
22
00 15
45
00 2C
P (measured)
LSW
MSW
32-bit
float
read-only
bara
46
00 2D
513
02 00
Fault status
16-bit
boolean
read-only
1 = no errors
514
02 01
Online status
16-bit
boolean
read-only
1 = online data
available
516
02 03
Error code
LSW
MSW
32-bit bit
field
read-only
0 = no errors
517
02 04
1283
05 02
Automatic purge on/off*
16-bit
boolean
read/write
1= automatic
purge on
1284
05 03
Start-up purge on/off*
16-bit
boolean
read/write
1 = start-up
purge on
1285
05 04
Purge in progress*
16-bit
boolean
read/write
1 = purge in
progress, write
1 for manual
start
1537
06 00
Address
16-bit
integer
read/write
1…255 (1 …
247 allowed in
Modbus)
* Device specifications are valid only if purge functions are kept enabled. Do not modify registers 1283, 1284,
and 1285. Regular purge is needed to guarantee accurate measurements. Modify only if instructed to by Vaisala.
PDU address
Actual address bytes used in a Mdbus Protocol data unit
LSW
Least significant word (bits 15 … 0)
MSW
Most significant word (bits 31 … 16)
16-bit integer
Numeric value in range 0 … 65535
16-bit boolean
Numeric value, 0 or 1
32-bit bit field
32 individual values, each 0 or 1
32-bit float
Floating point; IEEE 754 format
read-only
Register value cannot be changed with Modbus functions
read/write
Register value can be changed with Modbus functions
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